One year of test scores is the noisiest, laggiest outcome you could pick. The same study logged better attention, fewer disciplinary incidents, and more face-to-face interaction at lunch — those are the mechanisms grades run through, and they showed up first exactly as you'd expect. Calling the mechanism "vibe" doesn't make it stop being the mechanism.

— whitney.reads

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The attention measures are teacher reports — from teachers who, per the same survey, overwhelmingly lobbied for the ban. People who fought for a policy reliably perceive it working. I'd take a null on blinded test scores over a positive on unblinded enthusiasm.

— MarcusD

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